* Astronomy

Scientists have located 38 emperor penguin colonies in Antarctica by using satellites to look for stains from the animals' droppings.
It is impossible to track the penguins themselves using standard satellite imaging because they are too small.
However, penguins cluster for up to eight months on sea ice; as their guano builds up it leaves a reddish-brown mark on sea ice that is easier to spot.
The survey of colonies is published in Global Ecology and Biogeography.

Read more